Roll Packages from bd297cf62338 to 1b56cdeeb733 (4 revisions) (#187784)

https://github.com/flutter/packages/compare/bd297cf62338...1b56cdeeb733

2026-06-10 stuartmorgan@google.com [shared_preferences] Switch to Kotlin
Pigeon (flutter/packages#11661)
2026-06-10 tarrinneal@gmail.com [pigeon] updates toString and isNullish
methods (flutter/packages#11625)
2026-06-10 stuartmorgan@google.com [various] Remove moved packages
(flutter/packages#11850)
2026-06-10 engine-flutter-autoroll@skia.org Roll Flutter from
1bdf4af29076 to 66aaa9adb000 (30 revisions) (flutter/packages#11876)

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/flutter-packages-flutter-autoroll
Please CC flutter-ecosystem@google.com on the revert to ensure that a
human
is aware of the problem.

To file a bug in Flutter:
https://github.com/flutter/flutter/issues/new/choose

To report a problem with the AutoRoller itself, please file a bug:
https://issues.skia.org/issues/new?component=1389291&template=1850622

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+doc/main/autoroll/README.md
diff --git a/bin/internal/flutter_packages.version b/bin/internal/flutter_packages.version
index 1ca59c7..95b519d 100644
--- a/bin/internal/flutter_packages.version
+++ b/bin/internal/flutter_packages.version
@@ -1 +1 @@
-bd297cf6233836099fe1413f9e954ad24ec6f5f0
+1b56cdeeb733029126cd70c755187d6adf743421